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Mini Shell
Mini Shell
'use strict';
var test = require('tape');
var v = require('es-value-fixtures');
var forEach = require('for-each');
var inspect = require('object-inspect');
var hasOwn = require('hasown');
var hasPropertyDescriptors = require('has-property-descriptors')();
var getOwnPropertyDescriptors = require('object.getownpropertydescriptors');
var ownKeys = require('reflect.ownkeys');
var defineDataProperty = require('../');
test('defineDataProperty', function (t) {
t.test('argument validation', function (st) {
forEach(v.primitives, function (nonObject) {
st['throws'](
// @ts-expect-error
function () { defineDataProperty(nonObject, 'key', 'value'); },
TypeError,
'throws on non-object input: ' + inspect(nonObject)
);
});
forEach(v.nonPropertyKeys, function (nonPropertyKey) {
st['throws'](
// @ts-expect-error
function () { defineDataProperty({}, nonPropertyKey, 'value'); },
TypeError,
'throws on non-PropertyKey input: ' + inspect(nonPropertyKey)
);
});
forEach(v.nonBooleans, function (nonBoolean) {
if (nonBoolean !== null) {
st['throws'](
// @ts-expect-error
function () { defineDataProperty({}, 'key', 'value', nonBoolean); },
TypeError,
'throws on non-boolean nonEnumerable: ' + inspect(nonBoolean)
);
st['throws'](
// @ts-expect-error
function () { defineDataProperty({}, 'key', 'value', false, nonBoolean); },
TypeError,
'throws on non-boolean nonWritable: ' + inspect(nonBoolean)
);
st['throws'](
// @ts-expect-error
function () { defineDataProperty({}, 'key', 'value', false, false, nonBoolean); },
TypeError,
'throws on non-boolean nonConfigurable: ' + inspect(nonBoolean)
);
}
});
st.end();
});
t.test('normal data property', function (st) {
/** @type {Record<PropertyKey, string>} */
var obj = { existing: 'existing property' };
st.ok(hasOwn(obj, 'existing'), 'has initial own property');
st.equal(obj.existing, 'existing property', 'has expected initial value');
var res = defineDataProperty(obj, 'added', 'added property');
st.equal(res, void undefined, 'returns `undefined`');
st.ok(hasOwn(obj, 'added'), 'has expected own property');
st.equal(obj.added, 'added property', 'has expected value');
defineDataProperty(obj, 'existing', 'new value');
st.ok(hasOwn(obj, 'existing'), 'still has expected own property');
st.equal(obj.existing, 'new value', 'has new expected value');
defineDataProperty(obj, 'explicit1', 'new value', false);
st.ok(hasOwn(obj, 'explicit1'), 'has expected own property (explicit enumerable)');
st.equal(obj.explicit1, 'new value', 'has new expected value (explicit enumerable)');
defineDataProperty(obj, 'explicit2', 'new value', false, false);
st.ok(hasOwn(obj, 'explicit2'), 'has expected own property (explicit writable)');
st.equal(obj.explicit2, 'new value', 'has new expected value (explicit writable)');
defineDataProperty(obj, 'explicit3', 'new value', false, false, false);
st.ok(hasOwn(obj, 'explicit3'), 'has expected own property (explicit configurable)');
st.equal(obj.explicit3, 'new value', 'has new expected value (explicit configurable)');
st.end();
});
t.test('loose mode', { skip: !hasPropertyDescriptors }, function (st) {
var obj = { existing: 'existing property' };
defineDataProperty(obj, 'added', 'added value 1', true, null, null, true);
st.deepEqual(
getOwnPropertyDescriptors(obj),
{
existing: {
configurable: true,
enumerable: true,
value: 'existing property',
writable: true
},
added: {
configurable: true,
enumerable: !hasPropertyDescriptors,
value: 'added value 1',
writable: true
}
},
'in loose mode, obj still adds property 1'
);
defineDataProperty(obj, 'added', 'added value 2', false, true, null, true);
st.deepEqual(
getOwnPropertyDescriptors(obj),
{
existing: {
configurable: true,
enumerable: true,
value: 'existing property',
writable: true
},
added: {
configurable: true,
enumerable: true,
value: 'added value 2',
writable: !hasPropertyDescriptors
}
},
'in loose mode, obj still adds property 2'
);
defineDataProperty(obj, 'added', 'added value 3', false, false, true, true);
st.deepEqual(
getOwnPropertyDescriptors(obj),
{
existing: {
configurable: true,
enumerable: true,
value: 'existing property',
writable: true
},
added: {
configurable: !hasPropertyDescriptors,
enumerable: true,
value: 'added value 3',
writable: true
}
},
'in loose mode, obj still adds property 3'
);
st.end();
});
t.test('non-normal data property, ES3', { skip: hasPropertyDescriptors }, function (st) {
/** @type {Record<PropertyKey, string>} */
var obj = { existing: 'existing property' };
st['throws'](
function () { defineDataProperty(obj, 'added', 'added value', true); },
SyntaxError,
'nonEnumerable throws a Syntax Error'
);
st['throws'](
function () { defineDataProperty(obj, 'added', 'added value', false, true); },
SyntaxError,
'nonWritable throws a Syntax Error'
);
st['throws'](
function () { defineDataProperty(obj, 'added', 'added value', false, false, true); },
SyntaxError,
'nonWritable throws a Syntax Error'
);
st.deepEqual(
ownKeys(obj),
['existing'],
'obj still has expected keys'
);
st.equal(obj.existing, 'existing property', 'obj still has expected values');
st.end();
});
t.test('new non-normal data property, ES5+', { skip: !hasPropertyDescriptors }, function (st) {
/** @type {Record<PropertyKey, string>} */
var obj = { existing: 'existing property' };
defineDataProperty(obj, 'nonEnum', null, true);
defineDataProperty(obj, 'nonWrit', null, false, true);
defineDataProperty(obj, 'nonConf', null, false, false, true);
st.deepEqual(
getOwnPropertyDescriptors(obj),
{
existing: {
configurable: true,
enumerable: true,
value: 'existing property',
writable: true
},
nonEnum: {
configurable: true,
enumerable: false,
value: null,
writable: true
},
nonWrit: {
configurable: true,
enumerable: true,
value: null,
writable: false
},
nonConf: {
configurable: false,
enumerable: true,
value: null,
writable: true
}
},
'obj has expected property descriptors'
);
st.end();
});
t.test('existing non-normal data property, ES5+', { skip: !hasPropertyDescriptors }, function (st) {
// test case changing an existing non-normal property
/** @type {Record<string, null | string>} */
var obj = {};
Object.defineProperty(obj, 'nonEnum', { configurable: true, enumerable: false, value: null, writable: true });
Object.defineProperty(obj, 'nonWrit', { configurable: true, enumerable: true, value: null, writable: false });
Object.defineProperty(obj, 'nonConf', { configurable: false, enumerable: true, value: null, writable: true });
st.deepEqual(
getOwnPropertyDescriptors(obj),
{
nonEnum: {
configurable: true,
enumerable: false,
value: null,
writable: true
},
nonWrit: {
configurable: true,
enumerable: true,
value: null,
writable: false
},
nonConf: {
configurable: false,
enumerable: true,
value: null,
writable: true
}
},
'obj initially has expected property descriptors'
);
defineDataProperty(obj, 'nonEnum', 'new value', false);
defineDataProperty(obj, 'nonWrit', 'new value', false, false);
st['throws'](
function () { defineDataProperty(obj, 'nonConf', 'new value', false, false, false); },
TypeError,
'can not alter a nonconfigurable property'
);
st.deepEqual(
getOwnPropertyDescriptors(obj),
{
nonEnum: {
configurable: true,
enumerable: true,
value: 'new value',
writable: true
},
nonWrit: {
configurable: true,
enumerable: true,
value: 'new value',
writable: true
},
nonConf: {
configurable: false,
enumerable: true,
value: null,
writable: true
}
},
'obj ends up with expected property descriptors'
);
st.end();
});
t.test('frozen object, ES5+', { skip: !hasPropertyDescriptors }, function (st) {
var frozen = Object.freeze({ existing: true });
st['throws'](
function () { defineDataProperty(frozen, 'existing', 'new value'); },
TypeError,
'frozen object can not modify an existing property'
);
st['throws'](
function () { defineDataProperty(frozen, 'new', 'new property'); },
TypeError,
'frozen object can not add a new property'
);
st.end();
});
t.test('sealed object, ES5+', { skip: !hasPropertyDescriptors }, function (st) {
var sealed = Object.seal({ existing: true });
st.deepEqual(
Object.getOwnPropertyDescriptor(sealed, 'existing'),
{
configurable: false,
enumerable: true,
value: true,
writable: true
},
'existing value on sealed object has expected descriptor'
);
defineDataProperty(sealed, 'existing', 'new value');
st.deepEqual(
Object.getOwnPropertyDescriptor(sealed, 'existing'),
{
configurable: false,
enumerable: true,
value: 'new value',
writable: true
},
'existing value on sealed object has changed descriptor'
);
st['throws'](
function () { defineDataProperty(sealed, 'new', 'new property'); },
TypeError,
'sealed object can not add a new property'
);
st.end();
});
t.test('nonextensible object, ES5+', { skip: !hasPropertyDescriptors }, function (st) {
var nonExt = Object.preventExtensions({ existing: true });
st.deepEqual(
Object.getOwnPropertyDescriptor(nonExt, 'existing'),
{
configurable: true,
enumerable: true,
value: true,
writable: true
},
'existing value on non-extensible object has expected descriptor'
);
defineDataProperty(nonExt, 'existing', 'new value', true);
st.deepEqual(
Object.getOwnPropertyDescriptor(nonExt, 'existing'),
{
configurable: true,
enumerable: false,
value: 'new value',
writable: true
},
'existing value on non-extensible object has changed descriptor'
);
st['throws'](
function () { defineDataProperty(nonExt, 'new', 'new property'); },
TypeError,
'non-extensible object can not add a new property'
);
st.end();
});
t.end();
});
Zerion Mini Shell 1.0